mesenchyme, esp. somites grow in both head & body contributing to _____________

lateral body folds

head tail and lateral folds distinguish embryo from future ___________

umbilical chord

_______ contracting help to form the neural tube

actin filaments

umbilicus arises from which two things

yolk sac and connecting stalk

vitallene duct

connection between yolk sac and gut tube

allantois

blind ended sac from gut tube

origin of septum transversum

septum transversum is originially the most cranial structure just underneath the heart. When head fold starts growing rapidly it pushes heart and septum transversum down. Septum transversum will ultimately become the central tendon of the diaphram

oropharyngeal plate becomes

neck

cloacal plate becomes

anus

development of umbilical chord

the yolk sac and connecting stalks grow much more slowly than the head, tail, & lateral folds they thus turn into the umbilical chord